Dynamo-electric machine.



E. C. WRIGHT. DYNMO ELECTRIC MACHINE. APPLOATION FILED unse, 190e.

91 1 ,79;7. 9 Patented Feb. 9, 1909.

WTNSSSEa y UNITED srarEs- PATENT oEEIoE.

EDWIN C. WRIGHT, OF NEWPORT, KENTUCKY, ASSIGNOR TO THE BULLOCK ELECTRICMANUFACTURING COMPANY, A CORPORATION OF OHIO.

DYNAMIC-ELECTRIC MACHINE.

Specicaton of Letters Patent.

Patented Feb. 9, 1909.

Application lcd January 22, 196. Serial No. 297,136.

testing, shipping, etc. that the upper half of' the field frame beremovable from the lower half. Furthermore, 1t 1s customary to providefield members with auxiliary field Windl ings to prevent sparking atthebrushes.

These auxiliary field windings may be arranged on poles intermediate themain field poles, or may be distributed in slots in the inner faces ofthe4 pole shoes or both ar-v rangements may be employedl in the samemachine. lfVhen it is desired to balance the armature reactionlandy inalternating current machines'to neutralize the armature self-induction,the windings are distributed in the faces of Ithe pole shoes. This dis#tributed winding usually consists of coils arranged in groups whichextend between each adjacent pair of' poles. I/Vhen the Held member ofthe dynamo-electric machine is thus provided witha distributed balancing'wind- 'lng arranged in this manner, it is impossible to remove theupper half of the field elementl from the lower: half without firstremoving a.` portion of' the coils of the balancing wind` me' Theobjectof' my invention is to so construct and arrange the field polesand the field coils including the ycoils ofthe main and'auxiliary'windings that part or parts of the field frame can be removedcompletely v.without firstremoving or disturbing either the main fieldcoils or the coils of the balancing winding. This I accomplish byprovidingepole pieces, each of which is composed of' twoseparable-parts, the lines of vision of the parts of which poles arebetween the groups of the balancmgcoils. A

Other objects and novel features of my in- `vention will appear from thedetailed description.

My invention therefore consists in certain novel details ofconstruction, and combina-v tions and arrangements of elements describedin the specification and set forth in the appended claims.

The single figure of the accompanying drawing is a partly sectional endelevation of a dynamo-electric machine embodying my invention.

The shaft. 10 carries the rotating armature structure, which may be ofany desired type. The field frame 36 is divided along the line 37 in theusual manner. Extending inwardly from the `field frame are the mainpoles or cores 38, 39, 40 and 41. Although I have shown a fourpolemachine, I am not to be limited to this forni as any other number ofarmature coils which-are short-circuited by the brushes. As shown in thedrawing, the pole shoes are' provldedwith slots 45. Arranged in theseslots`arethe coils 4:6 of a distributed auxiliaiy field winding, calleda balancing winding. The object of the auX- iliary distributed windingis, as is Well known, to neutralize the armature reaction and to preventdistortion of the field. lThe coils of this distributed windingarearranged in groups, and the coils of each group are concentric andare arranged in thev slots of' the two adjacent halves of twoadjacentpoles, the groups being separated by the dividing lines of the halves ofthe poles.

4It is seen from the drawing that the line of division between-the partsof each pole is between the groups of coils and the lines of divisionbetween the parts of the poles 38 and 40 are substantially in line withthe lines of division 37 of the field frame. With this arrangement, the'upper part of the field element can be removed from the lower partWithout first removing either the main field coils or the auxiliaryfield coils.

I aina in my claims to cover all modifica? tions wnicli uo not involve adeparture Iroln tue spirit anu scopeor'niy invention.

lv'nat l claiin as new and desire to Secure by Letters raient is arableparis naving slotted inner end portions in engagement with each other, asepa.-`

raie heid con on each part, anda distributed y auxihaiy windingseparare' Iroin tue 'rieid cons and ha ving its cons arranged in groupsand located in tue slots or salu poles, tue groups beingseparated by tnelines o1 division between ine parts o the poles.

z. in a dynamo-electric mac-nine, a field frame, field poles eachconsisting o1 two separable parts, each part oI each pole having aslotted pole shoe portion, and coils of an auxiliary neld winning in thesiots of said portions, said coils -being arranged in groups, the cousintne slots or :the two parts of each pole being in different groups.

3. in aidynaino-eiectric inachine, a field frame; field poles eachconsisting of two separable parts having slotted pole shoe portions inengagement with each other, and distributed 4lield coils arranged ingroups and located in the slots of. said portions,

each group consisting of a number of concentric coils arranged in theslots of two adjacent parts of adjacent poles.

4. In a dynamo-electric machine, a eld frame, inain fieldpoles, fieldcoils thereon,

, the inner faces of the field poles being slotted, a distributedwinding, the coils of which are arranged in groups in the slots of thepole faces, the field frame', poles, main field coils land balancingcoils being so arranged and divided that one vhalf the fraine and onehalf of all the coils may be lifted from the other half. 't

5. ln a dy'namdelectric machine, a field frame, field poles havingslotted pole shoes, each pole consisting of two parts, a field coil oneach part, and a group of balancing coils having its conductors in tlieslots of adjacent parts of adjacent poles.

6. ln a-dynaino-'electric machine,fa ;field l. in a dynamo-electricmachine, a fieldv frame, field poles each consisting oI two sepwithoutlirst removing any of the field 8. ln a dynamo-electric machine, a fieldframe divided into two portions, field poles eacii `composed 0I twoseparable parts, distributed baianciiig coils arranged in groups, theline 0I division between tue parts oi: euch of two opposite polesoccurring substantially along tlienn'es or division or ine neidIranieand or lthe groups of the balancing coils.

`lfl'.' In a dynamo-electric machine, a field frame divided into twoportions, and vfield poles arranged opposite trie dividing lines in thefield Iranie, each of said poles consisting of'two parts, the innerfaces of which are in contact with each othervsubstantially along thedividing lines 1n the field frame,

mani field coils and distributed auxiliary field coils or balancingcoils on :the inner ends of the poles, tlie coils being so arranged'that the upper half' of'` the field frame and poles may be removed fromthe lower hallf coi s.

frame, field poles each divided into two portions, a separate field coilon each half 'ofA for producing commutating fields, a second auxiliaryfield Winding distributedin slots in the hpole faces, for balancing thelarmature reaction, said poles being so'constructed and the windingsbein so arranged that the upper half of the fie d frame and one half ofthe main field coils and auxiliary eld coils may be lifted from theother half. In testimony whereof I affix my signature, in the presenceof two witnesses.

' EDVIN C. WRIGHT.,

Witnesses:

ARTHUR F. Kwis, FRED J. KiissEY.

